The GMC Sierra 3500HD, in its fifth generation (GMTT1XX), received a significant facelift for the 2024 model year. This iteration continues GMC’s tradition of offering a heavy-duty pickup truck geared towards demanding work and substantial towing capacity. The Regular Cab Long Bed configuration, paired with the 6.6-liter V8 gasoline engine producing 401 horsepower, represents a work-focused variant within the Sierra 3500HD lineup. Introduced in 2024, this specific combination targets buyers prioritizing raw capability and a straightforward, no-frills approach to heavy-duty trucking. It sits below the Denali and AT4 trims, offering a more affordable entry point into the 3500HD range while still delivering impressive performance.
Technical Specifications
| Brand | GMC |
| Model | Sierra 3500HD |
| Generation | Sierra 3500HD V (GMTT1XX, facelift 2024) Regular Cab Long Bed |
| Type (Engine) | 6.6 V8 (401 Hp) DRW Automatic |
| Start of production | 2024 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 2 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.5 kg/Hp, 132.5 Hp/tonne |
| Weight-to-torque ratio | 4.8 kg/Nm, 207.9 Nm/tonne |
| Power | 401 Hp @ 5200 rpm |
| Torque | 629 Nm @ 4000 rpm, 463.93 lb.-ft. @ 4000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L8T |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.25 mm (4.06 in) |
| Piston Stroke | 98 mm (3.86 in) |
| Compression ratio | 10.8:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 7.6 l (8.03 US qt | 6.69 UK qt) |
| Coolant | 14.6 l (15.43 US qt | 12.85 UK qt) |
| Kerb Weight | 3026 kg (6671.19 lbs) |
| Max. weight | 6350 kg (13999.35 lbs) |
| Max load | 3324 kg (7328.17 lbs) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 8527 kg (18798.82 lbs) |
| Length | 6002 mm (236.3 in) |
| Width including mirrors | 2457 mm (96.73 in) |
| Height | 2038 mm (80.24 in) |
| Wheelbase | 3595 mm (141.54 in) |
| Front track | 1731 mm (68.15 in) |
| Rear (Back) track | 1905 mm (75 in) |
| Ride height (ground clearance) | 266 mm (10.47 in) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 10 gears, automatic transmission Allison |
| Front suspension | Independent torsion bar, double wishbone |
| Rear suspension | Rigid axle suspension, Leaf spring |
| Front brakes | Ventilated discs, 355×40 mm |
| Rear brakes | Ventilated discs, 355×40 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | 235/80 R17; 235/80 R18 |
| Wheel rims size | 6.5J x 17 |
Introduction
The 2024 GMC Sierra 3500HD Regular Cab Long Bed with the 6.6L V8 and automatic transmission is a heavy-duty pickup truck designed for serious work. Built on the GMTT1XX platform, this model represents a continuation of GMC’s commitment to providing robust and capable trucks for commercial and personal use. The Regular Cab configuration, combined with the long bed, prioritizes cargo space and utility, making it ideal for hauling materials and equipment. The facelift for 2024 brought updated styling and technology, but the core focus remained on delivering exceptional towing and payload capacity.
Powertrain & Engine Architecture
At the heart of this Sierra 3500HD lies the 6.6-liter L8T V8 gasoline engine. This engine is a naturally aspirated, overhead valve (OHV) design featuring direct fuel injection. The direct injection system optimizes combustion efficiency and power delivery. The engine produces 401 horsepower at 5200 rpm and 629 Nm (463.93 lb-ft) of torque at 4000 rpm. The engine’s robust construction and large displacement contribute to its ability to handle heavy loads. The engine is paired with a 10-speed Allison automatic transmission, known for its durability and smooth shifting. This transmission is specifically tuned for heavy-duty applications, providing optimal gear ratios for towing and hauling. The Allison transmission features electronic controls for precise shift points and enhanced performance.
Driving Characteristics
The 6.6L V8 and 10-speed automatic combination delivers a solid, if not particularly refined, driving experience. While not as quick as some of the newer turbocharged engines available in the market, the Sierra 3500HD offers ample power for most tasks. The 10-speed transmission helps keep the engine in its optimal power band, providing good acceleration even when heavily loaded. The gear ratios are well-suited for towing, allowing the truck to maintain speed on inclines without excessive downshifting. Compared to the available Duramax diesel engine, this gasoline V8 offers a lower initial cost but sacrifices fuel economy and ultimate towing capacity. The ride quality, typical of a heavy-duty truck, is firm, especially when unladen. However, the suspension is designed to absorb bumps and maintain stability when carrying a load.
Equipment & Trim Levels
The Regular Cab Long Bed 6.6L V8 trim typically comes with a functional, work-oriented interior. Standard features include a basic infotainment system with a touchscreen display, Bluetooth connectivity, and a rearview camera. The interior upholstery is typically vinyl or cloth, designed for durability and ease of cleaning. Optional extras could include upgraded infotainment systems with larger screens, navigation, and Apple CarPlay/Android Auto compatibility. Other available options might include power windows and locks, keyless entry, and a basic sound system. The focus of this trim level is on providing essential features for work, rather than luxury amenities.
Chassis & Braking
The Sierra 3500HD features a robust chassis designed to withstand heavy loads and demanding conditions. The front suspension utilizes an independent torsion bar and double wishbone setup, providing a comfortable ride and good handling. The rear suspension employs a traditional rigid axle with leaf springs, optimized for load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels, measuring 355×40 mm. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking. The steering system is a cone worm with recirculation balls, providing precise and responsive steering feel.
Market Reception & Comparison
Critics generally viewed the 6.6L V8 Sierra 3500HD as a capable work truck, but acknowledged its limitations compared to the diesel option. The gasoline engine offered a lower price point, making it attractive to buyers who didn’t require the ultimate towing capacity of the Duramax. Fuel economy was a common criticism, as the V8 engine consumes significantly more fuel than the diesel alternative. However, the V8’s simpler design and lower maintenance costs were seen as advantages. Compared to competitors like the Ford F-350 and Ram 3500, the Sierra 3500HD offered a competitive combination of power, capability, and value.
Legacy
The 6.6L V8 engine in the Sierra 3500HD has proven to be a reliable and durable powertrain. While not as fuel-efficient as newer engine technologies, it remains a popular choice for buyers who prioritize simplicity and affordability. On the used car market, these trucks are often sought after for their work capabilities and relatively low maintenance costs. The Allison 10-speed automatic transmission is also known for its longevity and smooth operation. As technology continues to evolve, the 2024 Sierra 3500HD with the 6.6L V8 represents a transitional model, bridging the gap between traditional heavy-duty trucks and the more technologically advanced offerings of the future.
